revert(web): drop vendored iced renderer

Keep iced_wgpu external and leave the WebGPU storage-buffer optimization out of scope.

Cargo.lock

@@ -2306,6 +2306,8 @@ dependencies = [
 [[package]]
 name = "iced_wgpu"
 version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ff144a999b0ca0f8a10257934500060240825c42e950ec0ebee9c8ae30561c13"
 dependencies = [
  "bitflags 2.13.1",
  "bytemuck",